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干旱是影响玉米产量的重要因素。在干旱条件下,玉米株高和穗位高往往受到影响,因此是研究耐旱性的重要指标。本研究利用A188×91黄15的F2∶3家系,进行株高和穗位高的数量性状位点(QTL)分析。结果表明,在水分胁迫条件下,分别各有10个QTL与株高和穗位高有关;在水分充足条件下,则检测到各有6个QTL与株高和穗位高有关。各QTL解释的表型变异在7.3%～53.9%之间。位于第8染色体上的QTL个数占总QTL近50%,LOD值均大于4.6,推测该染色体存在控制玉米株高和穗位高QTL的重要区域。本研究在bnlg1812标记附近检测到在水分胁迫下同时控制株高和穗位高的QTL,解释的表型变异在20%以上,该QTL是值得进一步研究和利用的位点。
Drought is an important factor affecting corn production. Under drought conditions, plant height and ear height are often affected, so it is an important index for studying drought tolerance. In this study, QTL analysis of QTLs for plant height and ear height was carried out using F2: 3 lines of A188 × 91 Huang15. The results showed that under the condition of water stress, 10 QTLs were related to plant height and ear height respectively. Under water sufficient conditions, 6 QTLs were detected in each plant height and ear height. The phenotypic variation explained by each QTL ranged from 7.3% to 53.9%. The number of QTLs on chromosome 8 accounted for nearly 50% of the total QTLs and the LOD values were greater than 4.6. It is presumed that there are important QTLs controlling the height and ear height of maize in this chromosome. In the present study, QTLs for controlling both plant height and ear height under water stress were detected in the vicinity of bnlg1812 marker. The explained phenotypic variation was above 20%, and the QTL is worth further study and utilization.